BTS remains open except for the Office of Airline Information, which is closed and not accepting data submissions due to an appropriations lapse.All BTS releases, except the Transportation Services Index, will be delayed.

For 2007-13, the methodology and data categories of the Highway Statistics series were updated, so the data from 1960-2006 are not comparable. In addition, this edition of table 4-9 is not comparable to editions from 2009 or earlier.